A computational model of Parkinsonian handwriting that highlights the role of the indirect pathway in the basal ganglia

Parkinsonian handwriting is typically characterized by micrographia, jagged line contour, and unusual fluctuations in pen velocity. In this paper we present a computational model of handwriting generation that highlights the role of the basal ganglia, particularly the indirect pathway. Whereas reduced dopamine levels resulted in reduced letter size, transition of STN–GPe dynamics from desynchronized (normal) to synchronized (PD) condition resulted in increased fluctuations in velocity in the model. We also present handwriting data from PD patients (n = 34) who are at various stages of disease and had taken medication various lengths of time before the handwriting sessions. The patient data are compared with those of age-matched controls. PD handwriting statistically exhibited smaller size and larger velocity fluctuation compared to normal handwriting.     

大学生学习动机的测量及其与自我效能感的关系

以270名大学生为被试,对Amabile等人编制的学习动机量表进行修订以确定其对中国被试的适用性,此外还探讨了大学生学习动机与一般自我效能感及领域专门的自我效能感之间的关系。研究结果表明:(1)学习动机量表可以明确区分成用于测量内生和外生动机的两个分量表,前者包括挑战性和热衷性两个维度,后者包括依赖他人评价、选择简单任务、关注人际竞争和追求回报等四个维度。两个分量表的多种信效度指标都十分理想,表明可用于对中国被试的有关研究。(2)男生的内生动机总分显著高于女生,而在外生动机总分上性别差异不显著。具体来看,男女生在挑战性和依赖他人评价两个维度的得分存在显著差异,男生的挑战性高于女生,而女生比男生更依赖他人评价。(3)被试一般的和领域专门的效能感都与内生动机呈正相关,而与外生动机无关。具体来看,效能感与内生和外生动机各维度中的挑战性、热衷性和关注人际竞争呈正相关,与选择简单任务呈负相关。     

发展性口吃的脑机制

口吃是一种常见的言语障碍,对此曾提出过大脑半球言语功能偏侧化异常假设。近期,发展性口吃的神经成像研究在支持这一经典假设的同时,还发现负责言语监控的颞叶系统和负责言语运动控制的额叶系统与皮层下脑结构存在功能失调,这可能损害言语产生时的精确时间控制。据此,研究者开始用神经网络的观点来解释发展性口吃产生的脑机制,认为患者可能存在由多个言语产生相关脑区构成的“双通路”网络的功能障碍     

内部动机与外部动机的关系

内部动机与外部动机的关系问题在20世纪90年代重新成为动机研究的热点。该文综述了内部动机与外部动机关系的实验研究与理论研究状况。认为实验研究经历了外部动机削弱内部动机、外部动机与内部动机共存、外部动机能够对内部动机产生促进作用三个阶段,研究者的心理学立场是造成分歧结果出现的重要原因;不同的理论模式各有所长,尤其是自我决定理论的新进展“有机辨证元理论”中关于需要的阐述是近期动机研究的亮点,在更高层次上实现了对内部动机与外部动机关系的整合。并提出探讨内部动机与外部动机具体成分之间的关系,检验特质状态与情境状态中二者的相互作用,及心理需要对情境与动机的中介机制应当成为未来研究的方向     

内部动机、外部动机与创造力的关系研究

本研究以277名文科三、四年级的大学生为被试,综合考察在故事、连线和命名任务下,内部动机,外部动机对创造力表现的影响。多变量方差分析发现,对于三个测验的共同部分,内部动机和外部动机的主效应均显著,但交互作用不显著。分别对每个任务进行方差分析发现,对于连线任务而言,内部动机和外部动机的主效应均显著;对于命名任务而言,外部动机的主效应显著,内部动机的主效应不显著;对于故事任务而言,内部动机和外部动机的主效应不显著。内部动机与外部动机之间在三个任务中均不存在显著的交互作用。多重回归分析发现,对于不同的任务,内部动机与外部动机的贡献显著不同。     

Conceptualizing ‘social capital’ for health promotion in small local communities: a micro‐qualitative study

This paper reports on a micro‐qualitative case study of peoples' experiences of local community life in a south‐east English town. This material is used as the basis for a critical discussion of the suitability of Putnam's notion of social capital as a conceptual tool for the design and evaluation of ‘community strengthening’ policies and interventions. The study was motivated by a concern that too much debate about social capital has been conducted by academics and policy‐makers in a top‐down manner, with inadequate attention to the realities of life in the local communities that they refer to. Three‐hour semi‐structured interviews were conducted with 37 residents in two less affluent wards in our town of interest. Informants—half men and half women, and spread across the 15–75 age group—were encouraged to talk about their personal experiences of local community life. Interview findings are presented within the ‘norm’ categories of trust, neighbourliness and reciprocal help and support, and the ‘network’ categories of participation in informal networks, voluntary groupings and community activist groupings. Our case study points to a number of ways in which Putnam's concept needs to be refined if it is to inform ‘community strengthening’ policies and interventions in England. Far more notice needs to be taken of the role played by informal networks of friends and neighbours in the construction of local community life. Attention also needs to be given to the complex and shifting geographical spread of peoples' significant social networks. Putnam's conceptualization of cohesive local communities and his unitary notions of trust and local identity may also be unduly essentialist. In our particular communities of interest, they failed to capture the fluidity of local community norms and networks in a rapidly changing society. They also failed to do justice to the extent to which social distinctions—such as age, gender, ethnicity and housing tenure—shape and constrain the way in which people create, sustain and access social capital. Copyright © 2001 John Wiley & Sons, Ltd.     

动机的结构与效应：基于动机连续体的视角

动机连续体是对内部动机、外部动机进行整合的心理学概念,其对内部动机和外部动机的争论提出了不同的假设。从大理论(grand theory)视角出发,对涉及上述两个概念的理论进行梳理,将自我决定理论与其他相关理论进行整合。由此展开对内部动机、外部动机结构的讨论,总结了动机的单维结构、多维结构和复杂结构假设下的理论新进展,分别论述在拮抗效应、累加效应和其他复杂效应等假设下动机对结果变量的影响,并展开不同效应对实践应用的讨论。     

The ghost of Christmas future: didn't Scrooge learn to be good? Commentary on Magnuson,McMurray, Tanenhaus,and Aslin (2003)

Magnuson, McMurray, Tanenhaus, and Aslin [Cogn. Sci. 27 (2003) 285] suggest that they have evidence of lexical feedback in speech perception, and that this evidence thus challenges the purely feedforward Merge model [Behav. Brain Sci. 23 (2000) 299]. This evidence is open to an alternative explanation, however, one which preserves the assumption in Merge that there is no lexical–prelexical feedback during on‐line speech processing. This explanation invokes the distinction between perceptual processing that occurs in the short term, as an utterance is heard, and processing that occurs over the longer term, for perceptual learning.     

A visual auditory model based on Growing Self-Organizing Maps to analyze the taxonomic response in early childhood

In this paper we present an extension of a visual auditory neural network model previously proposed by Mayor and Plunkett (2010) in order to explain the emergence of the taxonomic response in early childhood. The original model consists of two self-organizing maps (respectively, visual and acoustic) connected with Hebbian connections. With respect to the original model, our proposal adds two major features. First, our model follows a dynamic training regime, learning categories and word-object associations that evolve through time. Second, the visual and acoustic maps are Growing self-organizing maps that grow during training, when they are no longer able to consistently represent categories. With these two new characterizing features, our model replicates the performance of the original Mayor and Plunkett (2010)’s model, acquires psychological plausibility in the training regime, and avoids the risk of catastrophic interference.     

The Influence of Posttreatment Mutual Help Group Participation on the Friendship Networks of Substance Abuse Patients

The effect of 12-step mutual help groups (e.g., Narcotics Anonymous) on members' friendship networks has received little attention. This 1-year longitudinal study examined such effects in a sample of 2,337 male substance abuse inpatients, 57.7% of whom became significantly involved in 12-step activities (e.g., reading program literature, attending meetings) after treatment. An a priori model of the interplay of 12-step involvement and friendship networks was tested using structural equation modeling, and found to have excellent fit to the data. Twelve-step group involvement after treatment predicted better general friendship characteristics (e.g., number of close friends) and substance abuse-specific friendship characteristics (e.g., proportion of friends who abstain from drugs and alcohol) at follow-up. Results are discussed in terms of how mutual help group involvement benefits patients and how the self-help group evaluation paradigm should be broadened.